Realtime tracking of a movable cursor

Details Realtime tracking of a movable cursor Realtime tracking of a movable cursor

1983-12-20

1987-06-23

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340706, 340789, 178 18, G09G 302

Patent

active

046756655

ABSTRACT:
A method and apparatus for continuously updating a display of the coordinates of a light pen as it moves across a display screen involves executing a single iteration of an approximation calculation every refresh cycle of the display. The absolute screen coordinates are updated by the light pen tracking system and converted to application parameters written by the host computer into the display buffer work space. The orthogonal displacements, dx and dy, from a fixed reference point are determined. The distance and direction values from the reference point are converted to character form and inserted in the display buffer.

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patent: 3505561 (1970-04-01), Ward et al.
patent: 3505666 (1970-04-01), Thorpe
patent: 3651508 (1972-03-01), Scarborough, Jr. et al.
patent: 3997891 (1976-12-01), Iwamura et al.
patent: 4266253 (1981-05-01), Matherat
patent: 4392137 (1983-07-01), Intlekofer et al.
patent: 4468662 (1984-08-01), Tanaka
IBM Technical Disclosure Bulletin, vol. 21, No. 6, Nov. 1978, "Direct-View Storage Tube Light Pen Attachment" by W. F. Beausoleil & R. A. Linton, p. 2450.
Proceeding of the S.I.D., vol. 14/2, Second Quarter 1973, "An Improved Light Gun Tracking Algorithm Based On a Recursive Digital Filter" by Murray Kasselman, pp. 52-61.
Computer, vol. 9, No. 4, Apr. 1976, "Using a Microprocessor In An Intelligent Graphics Terminal" by J. Raymond and D. K. Banerji, pp. 18-25.
Proc. IEE, vol. 12, Dec. 1976, "High-Speed Interactive Graphical-Display System" by C. R. C. B. Parker & J. B. Gosling, pp. 1293-1298.

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